<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006-2014 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: 麦当苗儿 <zuojiazi@vip.qq.com> <http://www.zjzit.cn>
// +----------------------------------------------------------------------
namespace Think;

class Page {
	public $firstRow; // 起始行数
	public $listRows; // 列表每页显示行数
	public $parameter; // 分页跳转时要带的参数
	public $totalRows; // 总行数
	public $totalPages; // 分页总页面数
	public $rollPage = 11; // 分页栏每页显示的页数
	public $lastSuffix = true; // 最后一页是否显示总页数
	private $p = 'p'; // 分页参数名
	private $url = ''; // 当前链接URL
	private $nowPage = 1;
	
	// 分页显示定制
	protected $config = array (
			'header' => '条记录',
			'prev' => '上一页',
			'next' => '下一页',
			'first' => '首页',
			'last' => '末页',
			'theme' => ' %totalRow% %header% %nowPage%/%totalPage% 页 %upPage% %downPage% %first%  %prePage%  %linkPage%  %nextPage% %end%' 
	);
	
	/**
	 * 架构函数
	 *
	 * @param array $totalRows
	 *        	总的记录数
	 * @param array $listRows
	 *        	每页显示记录数
	 * @param array $parameter
	 *        	分页跳转的参数
	 */
	public function __construct($totalRows, $listRows = '', $parameter = '', $url = '') {
		$this->totalRows = $totalRows;
		$this->parameter = $parameter;
		$this->varPage = C ( 'VAR_PAGE' ) ? C ( 'VAR_PAGE' ) : 'p';
		if (! empty ( $listRows )) {
			$this->listRows = intval ( $listRows );
		}
		$this->totalPages = ceil ( $this->totalRows / $this->listRows ); // 总页数
		$this->coolPages = ceil ( $this->totalPages / $this->rollPage );
		$this->nowPage = ! empty ( $_GET [$this->varPage] ) ? intval ( $_GET [$this->varPage] ) : 1;
		if ($this->nowPage < 1) {
			$this->nowPage = 1;
		} elseif (! empty ( $this->totalPages ) && $this->nowPage > $this->totalPages) {
			$this->nowPage = $this->totalPages;
		}
		$this->firstRow = $this->listRows * ($this->nowPage - 1);
	}
	
	/**
	 * 定制分页链接设置
	 *
	 * @param string $name
	 *        	设置名称
	 * @param string $value
	 *        	设置值
	 */
	public function setConfig($name, $value) {
		if (isset ( $this->config [$name] )) {
			$this->config [$name] = $value;
		}
	}
	
	/**
	 * 生成链接URL
	 *
	 * @param integer $page
	 *        	页码
	 * @return string
	 */
	private function url($page) {
		return str_replace ( urlencode ( '[PAGE]' ), $page, $this->url );
	}
	
	/**
	 * 组装分页链接
	 *
	 * @return string
	 */
	public function show() {
		if (0 == $this->totalRows)
			return '';
		$p = $this->varPage;
		$nowCoolPage = ceil ( $this->nowPage / $this->rollPage );
		
		// 分析分页参数
		if ($this->url) {
			$depr = C ( 'URL_PATHINFO_DEPR' );
			$url = rtrim ( U ( '/' . $this->url, '', false ), $depr ) . $depr . '__PAGE__';
		} else {
			if ($this->parameter && is_string ( $this->parameter )) {
				parse_str ( $this->parameter, $parameter );
			} elseif (is_array ( $this->parameter )) {
				$parameter = $this->parameter;
			} elseif (empty ( $this->parameter )) {
				unset ( $_GET [C ( 'VAR_URL_PARAMS' )] );
				$var = ! empty ( $_POST ) ? $_POST : $_GET;
				if (empty ( $var )) {
					$parameter = array ();
				} else {
					$parameter = $var;
				}
			}
			$parameter [$p] = '__PAGE__';
			$url = U ( '', $parameter );
		}
		// 上下翻页字符串
		$upRow = $this->nowPage - 1;
		$downRow = $this->nowPage + 1;
		if ($upRow > 0) {
			$upPage = "<a href='" . str_replace ( '__PAGE__', $upRow, $url ) . "'>" . $this->config ['prev'] . "</a>";
		} else {
			$upPage = '';
		}
		
		if ($downRow <= $this->totalPages) {
			$downPage = "<a href='" . str_replace ( '__PAGE__', $downRow, $url ) . "'>" . $this->config ['next'] . "</a>";
		} else {
			$downPage = '';
		}
		// << < > >>
		if ($nowCoolPage == 1) {
			$theFirst = '';
			$prePage = '';
		} else {
			$preRow = $this->nowPage - $this->rollPage;
			$prePage = "<a href='" . str_replace ( '__PAGE__', $preRow, $url ) . "' >&lt;&lt;</a>"; // 上5页改成了 <<
			$theFirst = "<a href='" . str_replace ( '__PAGE__', 1, $url ) . "' >" . $this->config ['first'] . "</a>";
		}
		if ($nowCoolPage == $this->coolPages) {
			$nextPage = '';
			$theEnd = '';
		} else {
			$nextRow = $this->nowPage + $this->rollPage;
			$theEndRow = $this->totalPages;
			$nextPage = "<a href='" . str_replace ( '__PAGE__', $nextRow, $url ) . "' >&gt;&gt;</a>"; // 下5页 改成了 >>
			$theEnd = "<a href='" . str_replace ( '__PAGE__', $theEndRow, $url ) . "' >" . $this->config ['last'] . "</a>";
		}
		// 1 2 3 4 5
		$linkPage = "";
		for($i = 1; $i <= $this->rollPage; $i ++) {
			$page = ($nowCoolPage - 1) * $this->rollPage + $i;
			if ($page != $this->nowPage) {
				if ($page <= $this->totalPages) {
					$linkPage .= "<a href='" . str_replace ( '__PAGE__', $page, $url ) . "'>" . $page . "</a>"; // 去掉了此处的空格
				} else {
					break;
				}
			} else {
				if ($this->totalPages != 1) {
					// 当前页
					$linkPage .= "&nbsp;<span class='current'>" . $page . "</span>";
				}
			}
		}
		$pageStr = str_replace ( array (
				'%header%',
				'%nowPage%',
				'%totalRow%',
				'%totalPage%',
				'%upPage%',
				'%downPage%',
				'%first%',
				'%prePage%',
				'%linkPage%',
				'%nextPage%',
				'%end%' 
		), array (
				$this->config ['header'],
				$this->nowPage,
				$this->totalRows,
				$this->totalPages,
				$upPage,
				$downPage,
				$theFirst,
				$prePage,
				$linkPage,
				$nextPage,
				$theEnd 
		), $this->config ['theme'] );
		return $pageStr;
	}
}
